The numerical investigation on the stiffness of CuCGA interconnection under the condition of shearing

In this paper, the effect of the number and the spacing for copper columns to the copper column grid array (CuCGA) interconnection structure under the condition of shearing load was discussed by the means of nonlinear finite element method (FEM). The results as follows: Shear force increases significantly with the increase of shear displacement in the process of shearing, and according to the variation of the slope for curve of shear force-shear displacement, the curve can be divided into 3 stages before fracture occurring; With the increase of the number of copper columns, the slope for curve of shear force-shear displacement increase, which means the stiffness of the CuCGA interconnection structure increases with the increase of the number of copper columns. And with the increase of spacing for copper columns, the stiffness of CuCGA interconnection structure increase.